Mercurial > hg > truffle
view graal/com.oracle.jvmci.hotspot/src/com/oracle/jvmci/hotspot/logging/LoggingProxy.java @ 21687:afea1d08c393
Merge with df4579cb9503128c646bd04e66646ccfa7faf25f
author | Michael Van De Vanter <michael.van.de.vanter@oracle.com> |
---|---|
date | Tue, 02 Jun 2015 18:32:11 -0700 |
parents | 9579a3c62a9e |
children |
line wrap: on
line source
/* * Copyright (c) 2011, 2015, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. */ package com.oracle.jvmci.hotspot.logging; import java.lang.reflect.*; /** * A java.lang.reflect proxy that hierarchically logs all method invocations along with their * parameters and return values. */ public class LoggingProxy<T> implements InvocationHandler { private T delegate; public LoggingProxy(T delegate) { this.delegate = delegate; } @Override public Object invoke(Object proxy, Method method, Object[] args) throws Throwable { int argCount = args == null ? 0 : args.length; if (method.getParameterTypes().length != argCount) { throw new RuntimeException("wrong parameter count"); } StringBuilder str = new StringBuilder(); str.append(method.getReturnType().getSimpleName() + " " + method.getDeclaringClass().getSimpleName() + "." + method.getName() + "("); for (int i = 0; i < argCount; i++) { str.append(i == 0 ? "" : ", "); str.append(Logger.pretty(args[i])); } str.append(")"); Logger.startScope(str.toString()); final Object result; try { if (args == null) { result = method.invoke(delegate); } else { result = method.invoke(delegate, args); } } catch (InvocationTargetException e) { Logger.endScope(" = Exception " + e.getMessage()); throw e.getCause(); } Logger.endScope(" = " + Logger.pretty(result)); return result; } /** * The object returned by this method will implement all interfaces that are implemented by * delegate. */ public static <T> T getProxy(Class<T> interf, T delegate) { Class<?>[] interfaces = ProxyUtil.getAllInterfaces(delegate.getClass()); Object obj = Proxy.newProxyInstance(interf.getClassLoader(), interfaces, new LoggingProxy<>(delegate)); return interf.cast(obj); } }